<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>

  <div id="app"></div>
  
  <script src="./lib/vue.js"></script>
  <script>
    
    // 1.创建app
    const app = Vue.createApp({
      template: `<h1>Hello Vue</h1>`
    })

    // 2.挂载app
    app.mount("#app")

  </script>

</body>
</html>